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class=\u0022highwire-markup\u0022\u003E\u003Cdiv xmlns=\u0022http:\/\/www.w3.org\/1999\/xhtml\u0022 id=\u0022content-block-markup\u0022 data-highwire-cite-ref-tooltip-instance=\u0022highwire_reflinks_tooltip\u0022 xmlns:xhtml=\u0022http:\/\/www.w3.org\/1999\/xhtml\u0022\u003E\u003Cdiv class=\u0022article fulltext-view \u0022\u003E\u003Cspan class=\u0022highwire-journal-article-marker-start\u0022\u003E\u003C\/span\u003E\u003Cdiv class=\u0022contributors\u0022\u003E\u003Col class=\u0022contributor-list\u0022 id=\u0022contrib-group-1\u0022\u003E\u003Cli class=\u0022contributor\u0022 id=\u0022contrib-1\u0022\u003E\u003Cspan class=\u0022name\u0022\u003EM Dylan Bould\u003C\/span\u003E\u003Cspan class=\u0022contrib-role\u0022\u003E, staff anesthesiologist\u003C\/span\u003E\u003Ca id=\u0022xref-aff-1-1\u0022 class=\u0022xref-aff\u0022 href=\u0022#aff-1\u0022\u003E1\u003C\/a\u003E, \u003C\/li\u003E\u003Cli class=\u0022contributor\u0022 id=\u0022contrib-2\u0022\u003E\u003Cspan class=\u0022name\u0022\u003EEmily S Hladkowicz\u003C\/span\u003E\u003Cspan class=\u0022contrib-role\u0022\u003E, research assistant\u003C\/span\u003E\u003Ca id=\u0022xref-aff-2-1\u0022 class=\u0022xref-aff\u0022 href=\u0022#aff-2\u0022\u003E2\u003C\/a\u003E, \u003C\/li\u003E\u003Cli class=\u0022contributor\u0022 id=\u0022contrib-3\u0022\u003E\u003Cspan class=\u0022name\u0022\u003EAshlee-Ann E Pigford\u003C\/span\u003E\u003Cspan class=\u0022contrib-role\u0022\u003E, research assistant\u003C\/span\u003E\u003Ca id=\u0022xref-aff-2-2\u0022 class=\u0022xref-aff\u0022 href=\u0022#aff-2\u0022\u003E2\u003C\/a\u003E, \u003C\/li\u003E\u003Cli class=\u0022contributor\u0022 id=\u0022contrib-4\u0022\u003E\u003Cspan class=\u0022name\u0022\u003ELee-Anne Ufholz\u003C\/span\u003E\u003Cspan class=\u0022contrib-role\u0022\u003E, director\u003C\/span\u003E\u003Ca id=\u0022xref-aff-3-1\u0022 class=\u0022xref-aff\u0022 href=\u0022#aff-3\u0022\u003E3\u003C\/a\u003E, \u003C\/li\u003E\u003Cli class=\u0022contributor\u0022 id=\u0022contrib-5\u0022\u003E\u003Cspan class=\u0022name\u0022\u003ETatyana Postonogova\u003C\/span\u003E\u003Cspan class=\u0022contrib-role\u0022\u003E, research associate\u003C\/span\u003E\u003Ca id=\u0022xref-aff-4-1\u0022 class=\u0022xref-aff\u0022 href=\u0022#aff-4\u0022\u003E4\u003C\/a\u003E, \u003C\/li\u003E\u003Cli class=\u0022contributor\u0022 id=\u0022contrib-6\u0022\u003E\u003Cspan class=\u0022name\u0022\u003EEunkyung Shin\u003C\/span\u003E\u003Cspan class=\u0022contrib-role\u0022\u003E, research assistant\u003C\/span\u003E\u003Ca id=\u0022xref-aff-5-1\u0022 class=\u0022xref-aff\u0022 href=\u0022#aff-5\u0022\u003E5\u003C\/a\u003E, \u003C\/li\u003E\u003Cli class=\u0022last\u0022 id=\u0022contrib-7\u0022\u003E\u003Cspan class=\u0022name\u0022\u003ESylvain Boet\u003C\/span\u003E\u003Cspan class=\u0022contrib-role\u0022\u003E, staff anesthesiologist\u003C\/span\u003E\u003Ca id=\u0022xref-aff-6-1\u0022 class=\u0022xref-aff\u0022 href=\u0022#aff-6\u0022\u003E6\u003C\/a\u003E\u003C\/li\u003E\u003C\/ol\u003E\u003Col class=\u0022affiliation-list\u0022\u003E\u003Cli class=\u0022aff\u0022\u003E\u003Ca id=\u0022aff-1\u0022 name=\u0022aff-1\u0022\u003E\u003C\/a\u003E\u003Caddress\u003E\u003Csup\u003E1\u003C\/sup\u003EDepartment of Anesthesiology, Children\u2019s Hospital of Eastern Ontario, University of Ottawa, 401 Smyth Road, Ottawa, ON, Canada, K1H 8L1\u003C\/address\u003E\u003C\/li\u003E\u003Cli class=\u0022aff\u0022\u003E\u003Ca id=\u0022aff-2\u0022 name=\u0022aff-2\u0022\u003E\u003C\/a\u003E\u003Caddress\u003E\u003Csup\u003E2\u003C\/sup\u003EDepartment of Anesthesiology, Ottawa Hospital Research Institute, Ottawa\u003C\/address\u003E\u003C\/li\u003E\u003Cli class=\u0022aff\u0022\u003E\u003Ca id=\u0022aff-3\u0022 name=\u0022aff-3\u0022\u003E\u003C\/a\u003E\u003Caddress\u003E\u003Csup\u003E3\u003C\/sup\u003EHealth Sciences Library, University of Ottawa, Ottawa\u003C\/address\u003E\u003C\/li\u003E\u003Cli class=\u0022aff\u0022\u003E\u003Ca id=\u0022aff-4\u0022 name=\u0022aff-4\u0022\u003E\u003C\/a\u003E\u003Caddress\u003E\u003Csup\u003E4\u003C\/sup\u003EAllan Waters Family Simulation Centre, Li Ka Shing Knowledge Institute, St Michael\u2019s Hospital, Toronto, ON, Canada\u003C\/address\u003E\u003C\/li\u003E\u003Cli class=\u0022aff\u0022\u003E\u003Ca id=\u0022aff-5\u0022 name=\u0022aff-5\u0022\u003E\u003C\/a\u003E\u003Caddress\u003E\u003Csup\u003E5\u003C\/sup\u003EDepartment of Surgery, St Michael\u2019s Hospital, University of Toronto, Toronto\u003C\/address\u003E\u003C\/li\u003E\u003Cli class=\u0022aff\u0022\u003E\u003Ca id=\u0022aff-6\u0022 name=\u0022aff-6\u0022\u003E\u003C\/a\u003E\u003Caddress\u003E\u003Csup\u003E6\u003C\/sup\u003EDepartment of Anesthesiology, The Ottawa Hospital, University of Ottawa, Ottawa\u003C\/address\u003E\u003C\/li\u003E\u003C\/ol\u003E\u003Col class=\u0022corresp-list\u0022\u003E\u003Cli class=\u0022corresp\u0022 id=\u0022corresp-1\u0022\u003ECorrespondence to: M D Bould\u2002\u003Cspan class=\u0022em-link\u0022\u003E\u003Cspan class=\u0022em-addr\u0022\u003Edbould{at}cheo.on.ca\u003C\/span\u003E\u003C\/span\u003E\u003C\/li\u003E\u003C\/ol\u003E\u003Cul class=\u0022history-list\u0022\u003E\u003Cli xmlns:hwp=\u0022http:\/\/schema.highwire.org\/Journal\u0022 class=\u0022accepted\u0022 hwp:start=\u00222014-02-10\u0022\u003E\u003Cspan class=\u0022accepted-label\u0022\u003EAccepted \u003C\/span\u003E10 February 2014\u003C\/li\u003E\u003C\/ul\u003E\u003C\/div\u003E\u003Cdiv class=\u0022section abstract\u0022 id=\u0022abstract-1\u0022\u003E\u003Ch2\u003EAbstract\u003C\/h2\u003E\u003Cp id=\u0022p-2\u0022\u003E\u003Cstrong\u003EObjectives\u003C\/strong\u003E To examine indexed health science journals to evaluate the prevalence of Wikipedia citations, identify the journals that publish articles with Wikipedia citations, and determine how Wikipedia is being cited.\u003C\/p\u003E\u003Cp id=\u0022p-3\u0022\u003E\u003Cstrong\u003EDesign\u003C\/strong\u003E Bibliometric analysis.\u003C\/p\u003E\u003Cp id=\u0022p-4\u0022\u003E\u003Cstrong\u003EStudy selection\u003C\/strong\u003E Publications in the English language that included citations to Wikipedia were retrieved using the online databases Scopus and Web of Science.\u003C\/p\u003E\u003Cp id=\u0022p-5\u0022\u003E\u003Cstrong\u003EData sources\u003C\/strong\u003E To identify health science journals, results were refined using Ulrich\u2019s database, selecting for citations from journals indexed in Medline, PubMed, or Embase. Using Thomson Reuters Journal Citation Reports, 2011 impact factors were collected for all journals included in the search.\u003C\/p\u003E\u003Cp id=\u0022p-6\u0022\u003E\u003Cstrong\u003EData extraction\u003C\/strong\u003E Resulting citations were thematically coded, and descriptive statistics were calculated.\u003C\/p\u003E\u003Cp id=\u0022p-7\u0022\u003E\u003Cstrong\u003EResults\u003C\/strong\u003E 1433 full text articles from 1008 journals indexed in Medline, PubMed, or Embase with 2049 Wikipedia citations were accessed. The frequency of Wikipedia citations has increased over time; most citations occurred after December 2010. More than half of the citations were coded as definitions (n=648; 31.6%) or descriptions (n=482; 23.5%). Citations were not limited to journals with a low or no impact factor; the search found Wikipedia citations in many journals with high impact factors.\u003C\/p\u003E\u003Cp id=\u0022p-8\u0022\u003E\u003Cstrong\u003EConclusions\u003C\/strong\u003E Many publications are citing information from a tertiary source that can be edited by anyone, although permanent, evidence based sources are available. We encourage journal editors and reviewers to use caution when publishing articles that cite Wikipedia.\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv class=\u0022section intro\u0022 id=\u0022sec-1\u0022\u003E\u003Ch2\u003EIntroduction\u003C\/h2\u003E\u003Cp id=\u0022p-9\u0022\u003ELaunched on 15 January 2001, Wikipedia is self described as \u201ca free, collaboratively edited, and multilingual internet encyclopedia supported by the non-profit Wikimedia Foundation.\u201d\u003Ca id=\u0022xref-ref-1-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-1\u0022\u003E1\u003C\/a\u003E As of 2012 Wikipedia is the largest online reference site,\u003Ca id=\u0022xref-ref-2-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-2\u0022\u003E2\u003C\/a\u003E \u003Ca id=\u0022xref-ref-3-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-3\u0022\u003E3\u003C\/a\u003E and it is reported to be the most used online healthcare resource globally.\u003Ca id=\u0022xref-ref-4-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-4\u0022\u003E4\u003C\/a\u003E However, the assessment of Wikipedia as a credible source for information has been debated since its origin.\u003Ca id=\u0022xref-ref-5-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-5\u0022\u003E5\u003C\/a\u003E The impermanent nature of Wikipedia entries and concerns about quality have been raised as important matters.\u003Ca id=\u0022xref-ref-6-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-6\u0022\u003E6\u003C\/a\u003E\u003C\/p\u003E\u003Cp id=\u0022p-10\u0022\u003EThe literature on Wikipedia has concentrated on evaluating content and ensuring that users have access to appropriate information.\u003Ca id=\u0022xref-ref-5-2\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-5\u0022\u003E5\u003C\/a\u003E Only 13% of Wikipedia articles had identifiable errors when assessed by academics.\u003Ca id=\u0022xref-ref-7-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-7\u0022\u003E7\u003C\/a\u003E Giles and colleagues found that the number of factual errors, omissions, or misleading statements in Wikipedia articles was comparable to the Encyclopaedia Britannica.\u003Ca id=\u0022xref-ref-8-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-8\u0022\u003E8\u003C\/a\u003E In general, Wikipedia articles reference academic literature,\u003Ca id=\u0022xref-ref-9-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-9\u0022\u003E9\u003C\/a\u003E \u003Ca id=\u0022xref-ref-10-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-10\u0022\u003E10\u003C\/a\u003E and medical articles are overseen by WikiProject Medicine, which is driven by editorial oversight.\u003Ca id=\u0022xref-ref-2-2\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-2\u0022\u003E2\u003C\/a\u003E \u003Ca id=\u0022xref-ref-4-2\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-4\u0022\u003E4\u003C\/a\u003E Several studies have confirmed the accuracy of health specific Wikipedia articles and discuss the potential value in education of patients.\u003Ca id=\u0022xref-ref-2-3\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-2\u0022\u003E2\u003C\/a\u003E \u003Ca id=\u0022xref-ref-3-2\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-3\u0022\u003E3\u003C\/a\u003E \u003Ca id=\u0022xref-ref-8-2\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-8\u0022\u003E8\u003C\/a\u003E \u003Ca id=\u0022xref-ref-11-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-11\u0022\u003E11\u003C\/a\u003E \u003Ca id=\u0022xref-ref-12-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-12\u0022\u003E12\u003C\/a\u003E \u003Ca id=\u0022xref-ref-13-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-13\u0022\u003E13\u003C\/a\u003E \u003Ca id=\u0022xref-ref-14-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-14\u0022\u003E14\u003C\/a\u003E \u003Ca id=\u0022xref-ref-15-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-15\u0022\u003E15\u003C\/a\u003E Wikipedia has offered an innovative way to provide free access to information for people around the world.\u003Ca id=\u0022xref-ref-2-4\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-2\u0022\u003E2\u003C\/a\u003E \u003Ca id=\u0022xref-ref-4-3\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-4\u0022\u003E4\u003C\/a\u003E \u003Ca id=\u0022xref-ref-5-3\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-5\u0022\u003E5\u003C\/a\u003E To further improve the quality of these articles, medical professionals are being encouraged to contribute to Wikipedia.\u003Ca id=\u0022xref-ref-2-5\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-2\u0022\u003E2\u003C\/a\u003E \u003Ca id=\u0022xref-ref-16-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-16\u0022\u003E16\u003C\/a\u003E \u003Ca id=\u0022xref-ref-17-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-17\u0022\u003E17\u003C\/a\u003E \u003Ca id=\u0022xref-ref-18-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-18\u0022\u003E18\u003C\/a\u003E Studies have also examined groups that use Wikipedia, noting that, in addition to patients and nursing students,\u003Ca id=\u0022xref-ref-2-6\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-2\u0022\u003E2\u003C\/a\u003E \u003Ca id=\u0022xref-ref-3-3\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-3\u0022\u003E3\u003C\/a\u003E \u003Ca id=\u0022xref-ref-10-2\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-10\u0022\u003E10\u003C\/a\u003E \u003Ca id=\u0022xref-ref-19-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-19\u0022\u003E19\u003C\/a\u003E medical students and residents commonly access Wikipedia to acquire health information.\u003Ca id=\u0022xref-ref-20-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-20\u0022\u003E20\u003C\/a\u003E \u003Ca id=\u0022xref-ref-21-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-21\u0022\u003E21\u003C\/a\u003E \u003Ca id=\u0022xref-ref-22-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-22\u0022\u003E22\u003C\/a\u003E \u003Ca id=\u0022xref-ref-23-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-23\u0022\u003E23\u003C\/a\u003E Although physicians have been discouraged from relying on Wikipedia,\u003Ca id=\u0022xref-ref-16-2\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-16\u0022\u003E16\u003C\/a\u003E one study showed that in practice use of Wikipedia is as high as 70% among junior physicians.\u003Ca id=\u0022xref-ref-22-2\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-22\u0022\u003E22\u003C\/a\u003E In general, consultation of Wikipedia is a growing trend among academics. For example, among more than 1000 authors in\u003Cem\u003E Nature\u003C\/em\u003E, 17% reported that they consulted Wikipedia on a weekly basis.\u003Ca id=\u0022xref-ref-8-3\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-8\u0022\u003E8\u003C\/a\u003E As the public and healthcare professionals increasingly accept Wikipedia as a source of information, new questions emerge such as the appropriateness of citing Wikipedia in academic publications.\u003C\/p\u003E\u003Cp id=\u0022p-11\u0022\u003EThe controversial nature of citing Wikipedia as a reference source for academic information is threefold. Firstly, a theoretical concern exists that anyone with access to the internet can alter Wikipedia. This raises questions about the spread of unintentional misinformation, which is fuelled by acts of intentional vandalism that have gained media attention and have challenged the public\u2019s perception of Wikipedia.\u003Ca id=\u0022xref-ref-24-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-24\u0022\u003E24\u003C\/a\u003E \u003Ca id=\u0022xref-ref-25-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-25\u0022\u003E25\u003C\/a\u003E \u003Ca id=\u0022xref-ref-26-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-26\u0022\u003E26\u003C\/a\u003E However, the use of a wiki model addresses the fear that that the information on Wikipedia is not guaranteed to be correct. The concept of a wiki is based on the assumption that the majority is correct: if someone writes an erroneous statement on Wikipedia, the probability is considered to be high that someone else from the majority that is presumed to be correct will identify the error. This model has many advantages and allows Wikipedia to be a free source of a vast amount of collaborative information.\u003Ca id=\u0022xref-ref-2-7\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-2\u0022\u003E2\u003C\/a\u003E \u003Ca id=\u0022xref-ref-4-4\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-4\u0022\u003E4\u003C\/a\u003E \u003Ca id=\u0022xref-ref-5-4\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-5\u0022\u003E5\u003C\/a\u003E However, the scientific community still has concerns about the academic integrity of a model that in theory could be edited by anyone.\u003C\/p\u003E\u003Cp id=\u0022p-12\u0022\u003ESecondly, the changing nature of Wikipedia makes permanent versions difficult to access. Although Wikipedia maintains a detailed history of previous Wikipedia pages, current academic citation systems rarely require a citation to include time stamped access information detailed to the second. As Wikipedia pages are in constant change, unlike paper encyclopaedias in which readers can confidently find the permanent cited source, readers might find confirming that the Wikipedia reference is the exact version cited challenging, particularly if detailed time stamps are not included.\u003Ca id=\u0022xref-ref-27-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-27\u0022\u003E27\u003C\/a\u003E\u003C\/p\u003E\u003Cp id=\u0022p-13\u0022\u003EThirdly, citing tertiary sources such as Wikipedia, which are resources that compile or provide digests of secondary sources, has literary problems.\u003Ca id=\u0022xref-ref-28-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-28\u0022\u003E28\u003C\/a\u003E Secondary sources are books, articles, or unpublished literature that provide an interpretation of primary sources, which include original data, manuscripts, records, or documents. International guidelines state that authors should provide direct references to original research sources,\u003Ca id=\u0022xref-ref-29-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-29\u0022\u003E29\u003C\/a\u003E so citing Wikipedia or any other tertiary source in the academic literature opposes literary practice. To date, only one study has examined the frequency of citation of Wikipedia in the academic literature.\u003Ca id=\u0022xref-ref-30-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-30\u0022\u003E30\u003C\/a\u003E To our knowledge, no one has examined the frequency of Wikipedia citations in the health science literature and the ways in which Wikipedia citations are used. We aimed to evaluate the prevalence of Wikipedia citations in indexed health science journals, identify the health science journals that publish articles with Wikipedia citations, and determine how Wikipedia is being cited.\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv class=\u0022section methods\u0022 id=\u0022sec-2\u0022\u003E\u003Ch2\u003EMethods\u003C\/h2\u003E\u003Cdiv id=\u0022sec-3\u0022 class=\u0022subsection\u0022\u003E\u003Ch3\u003EData collection\u003C\/h3\u003E\u003Cp id=\u0022p-14\u0022\u003EIn February 2012 one investigator (LU) searched the ISI Web of Science and Scopus online databases to identify articles in the peer reviewed health science literature that had directly cited Wikipedia since its inception in 2001. She searched references of all articles in both databases on the same day for the word \u201cWikipedia\u201d or any possible derivation to account for spelling errors. The word could appear anywhere in the reference, so not all articles necessarily referenced Wikipedia but could be articles about Wikipedia. To focus on indexed health science literature, we refined the results by using Ulrich\u2019s Database to identify articles from journals indexed in at least one of Medline, PubMed, or Embase. We retrieved full text for the articles (including reviews, original research, editorials, letters to the editor, and case reports) identified in the search through the University of Ottawa library and associated Canadian inter-library loan services. We excluded citations when articles were not written in English or when full text was unavailable. Although citations originated in the health science literature, the topic of the citation could extend beyond health, so we included all Wikipedia pages that were cited in the academic literature. In the event that an article cited Wikipedia more than once, we considered all citations and created duplicate entries for that article.\u003C\/p\u003E\u003Cp id=\u0022p-15\u0022\u003EWe used Thomson Reuters Journal Citation Reports (JCR) to collected journals\u2019 2011 impact factors (a measure that reflects how frequently the average article in a journal has been cited in a particular period).\u003Ca id=\u0022xref-ref-31-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-31\u0022\u003E31\u003C\/a\u003E \u003Ca id=\u0022xref-ref-32-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-32\u0022\u003E32\u003C\/a\u003E JCR impact factors provide quantitative evidence about the position of one journal in relation to the competition and offer an approximation of the prestige of a journal. When interpreting the impact factor, one should consider only journals within the same subject category as the scores are relative.\u003Ca id=\u0022xref-ref-32-2\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-32\u0022\u003E32\u003C\/a\u003E JCR coverage includes the world\u2019s leading journals and offers a systematic, quantifiable means to critically evaluate them by measuring the influence and impact of research at the journal and category levels, as well as showing the relation between citing and cited journals. We did not recover other journal metrics because of the unique nature of JCR and its pre-eminence as a proxy to measure a journal\u2019s importance within a field.\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv id=\u0022sec-4\u0022 class=\u0022subsection\u0022\u003E\u003Ch3\u003EData extraction\/coding system\u003C\/h3\u003E\u003Cp id=\u0022p-16\u0022\u003EUsing an iterative process, we developed a descriptive coding strategy. Three investigators (MDB, SB, ESH) reached consensus on the distinction between categories. After independently reviewing 15% of citations, the three investigators met as a team to discuss their coding strategies. They developed an initial coding strategy and recoded citations with the new guide. The team continued this iterative process of coding, meeting, and refining the guide before the three authors reached agreement and the coding strategy was finalised. Emergent sub-codes were integrated into the coding system as they arose. Using the coding system, one investigator (ESH) systematically coded all Wikipedia citations. To ensure coding reliability, another investigator (AEP) coded 100 random citations with the same coding system.\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv id=\u0022sec-5\u0022 class=\u0022subsection\u0022\u003E\u003Ch3\u003EAnalysis\u003C\/h3\u003E\u003Cp id=\u0022p-17\u0022\u003EWe used SPSS 17.0 for statistical analysis. We calculated descriptive statistics for the frequency of Wikipedia citations by thematic code, the impact factor of journals citing Wikipedia (median, range), and the frequency of these statistics by year. We used the intra-class correlation coefficient to assess the inter-rater reliability.\u003C\/p\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cdiv class=\u0022section results\u0022 id=\u0022sec-6\u0022\u003E\u003Ch2\u003EResults\u003C\/h2\u003E\u003Cp id=\u0022p-18\u0022\u003EWe recovered 2359 publications (2307 from Scopus and an additional 52 from Web of Science) in our search. After excluding duplicates, non-English journals, and articles that did not directly cite Wikipedia, we retrieved full text for 1433 articles from 1008 indexed journals, with 2049 Wikipedia citations. In total, 2011 impact factors were available for 1420 citations in 980 articles from 650 indexed journals and were found in the JCR database.\u003C\/p\u003E\u003Cp id=\u0022p-19\u0022\u003ETable 1\u003Ca id=\u0022xref-table-wrap-1-1\u0022 class=\u0022xref-down-link\u0022 href=\u0022#T1\u0022\u003E\u003Cspan\u003E\u21d3\u003C\/span\u003E\u003C\/a\u003E shows the frequency of Wikipedia citations since 2001, the nature of citations (thematic code), and related impact factor information (median and range). The intra-class correlation coefficient for the two coders was 0.91 (P\u0026lt;0.001), indicating a high degree of inter-rater reliability. More than half of the citations were coded as definitions (n=648; 31.6%) or descriptions (n=482; 23.5%). For the purpose of this study, of the 13 categories, we considered citations (n=82; 4.0%) from only two categories (Citations about Wikipedia, and Wikipedia used in methods) to be the most appropriate uses of Wikipedia, as in these cases Wikipedia was the original source of information. Furthermore, we recovered 97 (4.8%) citations in which Wikipedia was cited in place of an original research study.\u003C\/p\u003E\u003Cdiv class=\u0022table pos-float\u0022 id=\u0022T1\u0022\u003E\u003Cdiv class=\u0022table\u0022\u003E\u003Cdiv class=\u0022table-caption\u0022\u003E\u003Cspan class=\u0022table-label\u0022\u003ETable 1\u003C\/span\u003E \u003Cp id=\u0022p-20\u0022 class=\u0022first-child\u0022\u003E\u2002Frequency of Wikipedia citations since 2001, categorised by code and impact factor\u003C\/p\u003E\u003Cdiv class=\u0022sb-div caption-clear\u0022\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cdiv class=\u0022table-inline\u0022\u003E\u003Cdiv class=\u0022callout\u0022\u003E\u003Cspan\u003EView this table:\u003C\/span\u003E\u003Cul class=\u0022callout-links\u0022\u003E\u003Cli\u003E\u003Ca href=\u0022\/highwire\/markup\/751746\/expansion?width=1000\u0026amp;height=500\u0026amp;iframe=true\u0026amp;postprocessors=highwire_figures%2Chighwire_math\u0022 class=\u0022colorbox colorbox-load table-expand-popup\u0022 rel=\u0022gallery-fragment-tables\u0022\u003EView popup\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003E\u003Ca href=\u0022##\u0022 class=\u0022table-expand-inline\u0022 data-table-url=\u0022\/highwire\/markup\/751746\/expansion?postprocessors=highwire_figures%2Chighwire_math\u0022\u003EView inline\u003C\/a\u003E\u003C\/li\u003E\u003C\/ul\u003E\u003C\/div\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cdiv\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cp id=\u0022p-22\u0022\u003EThe median impact factor of journals citing Wikipedia was 2.0 and has remained fairly consistent over time. However, the total number of Wikipedia citations has increased each year since 2004 except for between 2009 and 2010. The figure\u003Ca id=\u0022xref-fig-1-1\u0022 class=\u0022xref-down-link\u0022 href=\u0022#F1\u0022\u003E\u003Cspan\u003E\u21d3\u003C\/span\u003E\u003C\/a\u003E shows the number of articles that cite Wikipedia at least once by year up to 21 November 2013. Consistently since the inception of Wikipedia, journals with high impact factors have continued to publish references to Wikipedia. Table 2\u003Ca id=\u0022xref-table-wrap-2-1\u0022 class=\u0022xref-down-link\u0022 href=\u0022#T2\u0022\u003E\u003Cspan\u003E\u21d3\u003C\/span\u003E\u003C\/a\u003E illustrates the journals with the top 25 highest impact factors that emerged in our study. These journals accounted for 2.2% (n=3) of cases in which Wikipedia was the most appropriate citations (as previously defined). Table 3\u003Ca id=\u0022xref-table-wrap-3-1\u0022 class=\u0022xref-down-link\u0022 href=\u0022#T3\u0022\u003E\u003Cspan\u003E\u21d3\u003C\/span\u003E\u003C\/a\u003E specifies the titles and types of articles published in these journals, including the number of Wikipedia citations in each article. Journals with available impact factors that cited Wikipedia more than 10 times included \u003Cem\u003EExplore: The Journal of Science and Healing\u003C\/em\u003E (n=53), \u003Cem\u003EChild\u2019s Nervous System\u003C\/em\u003E (n=26), \u003Cem\u003EBMC Bioinformatics\u003C\/em\u003E (n=21), \u003Cem\u003ETheoretical Biology and Medical Modelling\u003C\/em\u003E (n=20), \u003Cem\u003EJournal of Medical Internet Research\u003C\/em\u003E (n=17), \u003Cem\u003EHealth Information and Libraries Journal\u003C\/em\u003E (n=13), \u003Cem\u003EBMJ\u003C\/em\u003E (n=13), \u003Cem\u003EJALA\u2014Journal of the Association for Laboratory Automation\u003C\/em\u003E (n=12), and \u003Cem\u003EAmerican Journal of Forensic Medicine and Pathology\u003C\/em\u003E (n=11).\u003C\/p\u003E\u003Cdiv id=\u0022F1\u0022 class=\u0022fig pos-float odd\u0022\u003E\u003Cdiv class=\u0022fig-inline\u0022\u003E\u003Cdiv class=\u0022highwire-figure\u0022\u003E\u003Cdiv class=\u0022fig-inline-img-wrapper\u0022\u003E\u003Cdiv class=\u0022fig-inline-img\u0022\u003E\u003Ca href=\u0022https:\/\/www.bmj.com\/content\/bmj\/348\/bmj.g1585\/F1.large.jpg?width=800\u0026amp;height=600\u0022 title=\u0022Number of articles that cite Wikipedia at least once by year since 2001. *Data from February 2012 to November 2013 were not included in detailed analysis\u0022 class=\u0022colorbox fragment-images colorbox-load\u0022 rel=\u0022gallery-fragment-images\u0022 data-figure-caption=\u0022\u0026lt;div class=\u0026quot;highwire-markup\u0026quot;\u0026gt;\u0026lt;div class=\u0026quot;fig-caption\u0026quot; xmlns:xhtml=\u0026quot;http:\/\/www.w3.org\/1999\/xhtml\u0026quot;\u0026gt;\u0026lt;p id=\u0026quot;p-23\u0026quot; class=\u0026quot;first-child\u0026quot;\u0026gt;Number of articles that cite Wikipedia at least once by year since 2001. *Data from February 2012 to November 2013 were not included in detailed analysis\u0026lt;\/p\u0026gt;\u0026lt;div class=\u0026quot;sb-div caption-clear\u0026quot;\u0026gt;\u0026lt;\/div\u0026gt;\u0026lt;\/div\u0026gt;\u0026lt;\/div\u0026gt;\u0022\u003E\u003Cimg class=\u0022fragment-image\u0022 src=\u0022https:\/\/www.bmj.com\/content\/bmj\/348\/bmj.g1585\/F1.medium.gif\u0022 alt=\u0022Figure1\u0022\/\u003E\u003C\/a\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cdiv xmlns:xhtml=\u0022http:\/\/www.w3.org\/1999\/xhtml\u0022 class=\u0022fig-caption\u0022\u003E\u003Cp id=\u0022p-23\u0022 class=\u0022first-child\u0022\u003ENumber of articles that cite Wikipedia at least once by year since 2001. *Data from February 2012 to November 2013 were not included in detailed analysis\u003C\/p\u003E\u003Cdiv class=\u0022sb-div caption-clear\u0022\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cul class=\u0022highwire-figure-links list-inline\u0022\u003E\u003Cli class=\u0022download-fig first\u0022\u003E\u003Ca href=\u0022https:\/\/www.bmj.com\/content\/bmj\/348\/bmj.g1585\/F1.large.jpg?download=true\u0022 class=\u0022highwire-figure-link highwire-figure-link-download\u0022 title=\u0022Download Figure1\u0022\u003EDownload figure\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli class=\u0022new-tab\u0022\u003E\u003Ca href=\u0022https:\/\/www.bmj.com\/content\/bmj\/348\/bmj.g1585\/F1.large.jpg\u0022 class=\u0022highwire-figure-link highwire-figure-link-newtab\u0022 target=\u0022_blank\u0022\u003EOpen in new tab\u003C\/a\u003E\u003C\/li\u003E\n\u003Cli class=\u0022download-ppt last\u0022\u003E\u003Ca href=\u0022\/highwire\/powerpoint\/751745\u0022 class=\u0022highwire-figure-link highwire-figure-link-ppt\u0022\u003EDownload powerpoint\u003C\/a\u003E\u003C\/li\u003E\n\u003C\/ul\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cdiv class=\u0022fig-caption\u0022 xmlns:xhtml=\u0022http:\/\/www.w3.org\/1999\/xhtml\u0022\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cdiv class=\u0022table pos-float\u0022 id=\u0022T2\u0022\u003E\u003Cdiv class=\u0022table\u0022\u003E\u003Cdiv class=\u0022table-caption\u0022\u003E\u003Cspan class=\u0022table-label\u0022\u003ETable 2\u003C\/span\u003E \u003Cp id=\u0022p-24\u0022 class=\u0022first-child\u0022\u003E\u200225 journals with highest impact factors that have cited Wikipedia since 2001\u003C\/p\u003E\u003Cdiv class=\u0022sb-div caption-clear\u0022\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cdiv class=\u0022table-inline\u0022\u003E\u003Cdiv class=\u0022callout\u0022\u003E\u003Cspan\u003EView this table:\u003C\/span\u003E\u003Cul class=\u0022callout-links\u0022\u003E\u003Cli\u003E\u003Ca href=\u0022\/highwire\/markup\/751747\/expansion?width=1000\u0026amp;height=500\u0026amp;iframe=true\u0026amp;postprocessors=highwire_figures%2Chighwire_math\u0022 class=\u0022colorbox colorbox-load table-expand-popup\u0022 rel=\u0022gallery-fragment-tables\u0022\u003EView popup\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003E\u003Ca href=\u0022##\u0022 class=\u0022table-expand-inline\u0022 data-table-url=\u0022\/highwire\/markup\/751747\/expansion?postprocessors=highwire_figures%2Chighwire_math\u0022\u003EView inline\u003C\/a\u003E\u003C\/li\u003E\u003C\/ul\u003E\u003C\/div\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cdiv\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cdiv class=\u0022table pos-float\u0022 id=\u0022T3\u0022\u003E\u003Cdiv class=\u0022table\u0022\u003E\u003Cdiv class=\u0022table-caption\u0022\u003E\u003Cspan class=\u0022table-label\u0022\u003ETable 3\u003C\/span\u003E \u003Cp id=\u0022p-26\u0022 class=\u0022first-child\u0022\u003E\u200225 journals with highest impact factors: article titles, types, and number of Wikipedia citations\u003C\/p\u003E\u003Cdiv class=\u0022sb-div caption-clear\u0022\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cdiv class=\u0022table-inline\u0022\u003E\u003Cdiv class=\u0022callout\u0022\u003E\u003Cspan\u003EView this table:\u003C\/span\u003E\u003Cul class=\u0022callout-links\u0022\u003E\u003Cli\u003E\u003Ca href=\u0022\/highwire\/markup\/751748\/expansion?width=1000\u0026amp;height=500\u0026amp;iframe=true\u0026amp;postprocessors=highwire_figures%2Chighwire_math\u0022 class=\u0022colorbox colorbox-load table-expand-popup\u0022 rel=\u0022gallery-fragment-tables\u0022\u003EView popup\u003C\/a\u003E\u003C\/li\u003E\u003Cli\u003E\u003Ca href=\u0022##\u0022 class=\u0022table-expand-inline\u0022 data-table-url=\u0022\/highwire\/markup\/751748\/expansion?postprocessors=highwire_figures%2Chighwire_math\u0022\u003EView inline\u003C\/a\u003E\u003C\/li\u003E\u003C\/ul\u003E\u003C\/div\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cdiv\u003E\u003C\/div\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cdiv class=\u0022section discussion\u0022 id=\u0022sec-7\u0022\u003E\u003Ch2\u003EDiscussion\u003C\/h2\u003E\u003Cp id=\u0022p-27\u0022\u003EOur findings illustrate a relatively small but increasing frequency of citations of Wikipedia in indexed health sciences literature. We retrieved 2049 Wikipedia citations, in 1433 articles from 1008 journals indexed in Medline, PubMed, or Embase. Most of these citations occurred after December 2010 and were consistently found in journals with low impact factors and journals without impact factors, as well as in journals with high impact factors, including \u003Cem\u003ENature\u003C\/em\u003E, \u003Cem\u003EScience\u003C\/em\u003E, and the \u003Cem\u003EBMJ\u003C\/em\u003E. Using the descriptive coding strategy, we found a wide variety of uses for Wikipedia citations in the literature, the most common being definitions and descriptive statements.\u003C\/p\u003E\u003Cdiv id=\u0022sec-8\u0022 class=\u0022subsection\u0022\u003E\u003Ch3\u003EStrengths and limitations\u003C\/h3\u003E\u003Cp id=\u0022p-28\u0022\u003EAs the first study to describe the citation practices of Wikipedia (how, where, when, and so on) in indexed health science literature, our study adds insight into the role that Wikipedia may play in academic literature. We also provide information about the quality of the journals that cite Wikipedia, measured through impact factors from the Journal Citation Reports. The study searched citations from two well recognised databases (Scopus and Web of Science) and included all English language journals available in full text at Canadian university libraries, so some citations may have been excluded from the search because of the search criteria. However, the study used two comprehensive databases that probably captured most citations from journals with reaching influence as well as high impact factors. Although we report an increasing number of Wikipedia citations, the health science literature is expansive; therefore, papers that have cited Wikipedia remain a small minority of all published papers, albeit with increasing frequency.\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv id=\u0022sec-9\u0022 class=\u0022subsection\u0022\u003E\u003Ch3\u003EComparison with other studies\u003C\/h3\u003E\u003Cp id=\u0022p-29\u0022\u003EActive research on Wikipedia has examined the role of academic citations in Wikipedia, content validity, and interactions between Wikipedia and user groups.\u003Ca id=\u0022xref-ref-5-5\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-5\u0022\u003E5\u003C\/a\u003E The only other study to examine Wikipedia in the scholarly references was completed by Park in 2011.\u003Ca id=\u0022xref-ref-30-2\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-30\u0022\u003E30\u003C\/a\u003E In this bibliometric analysis, Park also used the ISI Web of Science and Scopus databases to identify the total number of studies (n=1746), as well as leading authors, their institutional affiliations, most frequent publication sources, main academic fields, and other statistics on the frequency with which scholarly articles cite Wikipedia. Our study took Park\u2019s analysis further. Firstly, we used Ulrich\u2019s database to refine search findings to be specific to health sciences literature. Secondly, we examined how Wikipedia is being cited. Both studies show a general increase in frequency of citations over time, suggesting that if Park\u2019s data were to extend beyond 2010 they would continue to show increasing Wikipedia citations. While Park identified the publications that cited Wikipedia most often, our study also provides impact factors, adding information about journals\u2019 impact.\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv id=\u0022sec-10\u0022 class=\u0022subsection\u0022\u003E\u003Ch3\u003EContextualisation and policy implications\u003C\/h3\u003E\u003Cp id=\u0022p-30\u0022\u003EJust because more researchers are citing Wikipedia does not necessarily justify it as a valid source of information for citation. Wikipedia itself has cautioned against using Wikipedia as a source,\u003Ca id=\u0022xref-ref-33-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-33\u0022\u003E33\u003C\/a\u003E and some universities have gone so far as to ban students from citing Wikipedia.\u003Ca id=\u0022xref-ref-34-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-34\u0022\u003E34\u003C\/a\u003E Recognising that learning modalities are changing and evolving increasingly towards online and e-resources,\u003Ca id=\u0022xref-ref-21-2\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-21\u0022\u003E21\u003C\/a\u003E \u003Ca id=\u0022xref-ref-23-2\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-23\u0022\u003E23\u003C\/a\u003E \u003Ca id=\u0022xref-ref-35-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-35\u0022\u003E35\u003C\/a\u003E \u003Ca id=\u0022xref-ref-36-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-36\u0022\u003E36\u003C\/a\u003E we believe that ensuring that peer reviewed academic literature aligns with the International Committee of Medical Journal Editors (ICMJE) guidelines is still important. Relevant to this study, the ICMJE guidelines state that \u201cReaders should therefore be provided with direct references to original research sources whenever possible.\u201d\u003Ca id=\u0022xref-ref-29-2\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-29\u0022\u003E29\u003C\/a\u003E Although people have been argued that Wikipedia is comparable to an encyclopedia in terms of accuracy,\u003Ca id=\u0022xref-ref-8-4\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-8\u0022\u003E8\u003C\/a\u003E \u003Ca id=\u0022xref-ref-37-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-37\u0022\u003E37\u003C\/a\u003E this argument overlooks the literary problems associated with citing a tertiary source intended to direct researchers to an appropriate reference.\u003Ca id=\u0022xref-ref-34-2\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-34\u0022\u003E34\u003C\/a\u003E We echo the findings of other researchers who believe that Wikipedia should not be cited when a more authoritative\u2014that is, primary, permanent, peer reviewed, evidence based\u2014source exists\u003Ca id=\u0022xref-ref-6-2\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-6\u0022\u003E6\u003C\/a\u003E; however, Wikipedia may be the most appropriate source to cite for a definition of Wikipedia and in situations in which Wikipedia is used as part of the scientific methods (for example, a search strategy). Outside of those rare instances, arguing that citation of Wikipedia in the academic literature is appropriate is difficult. Our \u201coriginal research\u201d category further illustrates how Wikipedia was often cited when the authors could have cited an original research study. For example, one article stated that \u201cSome researchers propose that vitamin D supplementation may be beneficial in the treatment and prevention of some types of cancer,\u201d\u003Ca id=\u0022xref-ref-38-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-38\u0022\u003E38\u003C\/a\u003E and rather than citing the original sources provided on the Wikipedia page, the author instead cited Wikipedia.\u003C\/p\u003E\u003Cp id=\u0022p-31\u0022\u003EEvidence based medicine requires that clinical decisions are made using professional expertise in conjunction with replicable evidence from systematic research.\u003Ca id=\u0022xref-ref-39-1\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-39\u0022\u003E39\u003C\/a\u003E As Wikipedia entries are constantly changing, they may be difficult to access in the form that was originally cited by the time the work is published, reducing the reader\u2019s ability to reproduce the author\u2019s process.\u003Ca id=\u0022xref-ref-27-2\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-27\u0022\u003E27\u003C\/a\u003E In a study by Peoples,\u003Ca id=\u0022xref-ref-6-3\u0022 class=\u0022xref-bibr\u0022 href=\u0022#ref-6\u0022\u003E6\u003C\/a\u003E most citations to Wikipedia did not reference the date and time at which the entry was visited. Although Wikipedia does have a history function that allows users to access previous versions of the page, this function may not be obvious to most users, and determining which version was accessed for citations that do not denote the date and time of the visit can be difficult. If Wikipedia is to be cited in the future, not only the date accessed but also the time should be included so that future researchers can access the entry as it was originally viewed. Thus, the process of peer review should include close attention to the references that appear in articles before recommending them for publication and potentially approving information that contradicts evidence based research.\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv id=\u0022sec-11\u0022 class=\u0022subsection\u0022\u003E\u003Ch3\u003EFuture directions\u003C\/h3\u003E\u003Cp id=\u0022p-32\u0022\u003EAlthough the proportion of retrieved Wikipedia citations in the indexed health science literature was relatively small, the increasing trend of citation is still important to note. The study of how Wikipedia is used in the academic literature is relatively young, and beginning an open discourse around the appropriateness of using non-permanent Wikipedia citations in the academic literature seems timely. The relationship between academic publication and Wikipedia remains largely understudied, and international guidelines such as those of the ICJME, World Association of Medical Editors, and Council of Science Editors lack editorial guidance on the subject. Although our study does not provide evidence of harm by these citations, even those that substitute for a permanent primary research source, we emphasise the need for a consistent voice on how Wikipedia should be used in the academic literature. This study begs the broader question of \u201cwhat is an appropriate reference source?\u201d Is it something that is generated by the scientific method, is replicable, and undergoes rigorous peer review or is it something that is collaboratively generated, readily open to editing, and broadly accepted? We call attention to the need to work with the Wikipedia community to establish guidelines not only for reviewers and editors but also for academics drafting publications.\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv id=\u0022sec-12\u0022 class=\u0022subsection\u0022\u003E\u003Ch3\u003EConclusion\u003C\/h3\u003E\u003Cp id=\u0022p-33\u0022\u003EAn increasing number of peer reviewed academic papers in the health sciences are citing Wikipedia. The apparent increase in the frequency of citations of Wikipedia may suggest a lack of understanding by authors, reviewers, or editors of the mechanisms by which Wikipedia evolves. Although only a very small proportion of citations are of Wikipedia pages, the possibility for the spread of misinformation from an unverified source is at odds with the principles of robust scientific methodology and could potentially affect care of patients. We caution against this trend and suggest that editors and reviewers insist on citing primary sources of information where possible.\u003C\/p\u003E\u003Cdiv class=\u0022style4\u0022 id=\u0022boxed-text-1\u0022\u003E\u003Cdiv id=\u0022sec-13\u0022 class=\u0022subsection\u0022\u003E\u003Ch4\u003EWhat is already known on this topic\u003C\/h4\u003E\u003Cul class=\u0022list-simple \u0022 id=\u0022list-1\u0022\u003E\u003Cli id=\u0022list-item-1\u0022\u003E\u003Cp id=\u0022p-34\u0022\u003EThe use of Wikipedia as a source of academic information has been debated since its origin, but it is increasingly cited in peer reviewed health science literature\u003C\/p\u003E\u003C\/li\u003E\u003Cli id=\u0022list-item-2\u0022\u003E\u003Cp id=\u0022p-35\u0022\u003EAlthough studies have examined the content and vailidity of Wikipedia, no evidence has been published about how this resource is being used in health science literature\u003C\/p\u003E\u003C\/li\u003E\u003C\/ul\u003E\u003C\/div\u003E\u003Cdiv id=\u0022sec-14\u0022 class=\u0022subsection\u0022\u003E\u003Ch4\u003EWhat this paper adds\u003C\/h4\u003E\u003Cul class=\u0022list-simple \u0022 id=\u0022list-2\u0022\u003E\u003Cli id=\u0022list-item-3\u0022\u003E\u003Cp id=\u0022p-36\u0022\u003EAlthough a few instances exist that may warrant using Wikipedia as a reference, Wikipedia is often cited when permanent, evidence based sources are available\u003C\/p\u003E\u003C\/li\u003E\u003Cli id=\u0022list-item-4\u0022\u003E\u003Cp id=\u0022p-37\u0022\u003EAuthors, reviewers, and editors should use caution when publishing articles that include Wikipedia citations\u003C\/p\u003E\u003C\/li\u003E\u003C\/ul\u003E\u003C\/div\u003E\u003C\/div\u003E\u003C\/div\u003E\u003C\/div\u003E\u003Cdiv class=\u0022section notes\u0022 id=\u0022notes-2\u0022\u003E\u003Ch2\u003ENotes\u003C\/h2\u003E\u003Cp id=\u0022p-44\u0022\u003E\u003Cstrong\u003ECite this as:\u003C\/strong\u003E \u003Cem\u003EBMJ\u003C\/em\u003E 2014;348:g1585\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv class=\u0022section fn-group\u0022 id=\u0022fn-group-1\u0022\u003E\u003Ch2\u003EFootnotes\u003C\/h2\u003E\u003Cul\u003E\u003Cli class=\u0022fn-participating-researchers\u0022 id=\u0022fn-1\u0022\u003E\u003Cp id=\u0022p-38\u0022\u003EContributors: MDB and SB were involved in the conception and design of the study, the analysis of the data, and critical review of the manuscript. ESH was involved in the conception and design of the study, the analysis and interpretation of data, and critical review of the manuscript. AEP was involved in the analysis and interpretation of data and drafted the manuscript. LU was involved in the conception and design of the study, interpretation of the data, and critical review of the manuscript. TP and ES were involved in collection and analysis of data and critically revised the manuscript. All authors had full access to all data and reviewed the final version to be published. MDB and SB are the guarantors.\u003C\/p\u003E\u003C\/li\u003E\u003Cli class=\u0022fn-financial-disclosure\u0022 id=\u0022fn-2\u0022\u003E\u003Cp id=\u0022p-39\u0022\u003EFunding: The study was funded by the Children\u2019s Hospital of Eastern Ontario Department of Anesthesiology, University of Ottawa, and the Ottawa Hospital Department of Anesthesiology, University of Ottawa. The funding sources had no role in the study design; the collection, analysis, and interpretation of data; or the writing of the article and the decision to submit it for publication.\u003C\/p\u003E\u003C\/li\u003E\u003Cli class=\u0022fn-conflict\u0022 id=\u0022fn-3\u0022\u003E\u003Cp id=\u0022p-40\u0022\u003ECompeting interests: All authors have completed the ICMJE uniform disclosure form at \u003Ca href=\u0022http:\/\/www.icmje.org\/coi_disclosure.pdf\u0022\u003Ewww.icmje.org\/coi_disclosure.pdf\u003C\/a\u003E and declare: no support from any organisation for the submitted work; no financial relationships with any organisations that might have an interest in the submitted work in the previous three years; no other relationships or activities that could appear to have influenced the submitted work.\u003C\/p\u003E\u003C\/li\u003E\u003Cli class=\u0022fn\u0022 id=\u0022fn-4\u0022\u003E\u003Cp id=\u0022p-41\u0022\u003EEthical approval: Not needed. All the data presented are in the public domain. Citation information and full text articles were acquired through the ISI Web of Science and Scopus databases. As the accepted practice is not to seek consent to report on information in the public domain, we did not do so for this study, and nor did we seek approval from our research ethics board.\u003C\/p\u003E\u003C\/li\u003E\u003Cli class=\u0022fn\u0022 id=\u0022fn-5\u0022\u003E\u003Cp id=\u0022p-42\u0022\u003ETransparency: The lead author (MDB) affirms that this manuscript is an honest, accurate, and transparent account of the study being reported; that no important aspects of the study have been omitted; and that any discrepancies from the study as planned (and, if relevant, registered) have been explained.\u003C\/p\u003E\u003C\/li\u003E\u003Cli class=\u0022fn\u0022 id=\u0022fn-6\u0022\u003E\u003Cp id=\u0022p-43\u0022\u003EData sharing: No additional data available.\u003C\/p\u003E\u003C\/li\u003E\u003C\/ul\u003E\u003C\/div\u003E\u003Cdiv class=\u0022license\u0022 id=\u0022license-1\u0022\u003E\u003Cp id=\u0022p-1\u0022\u003EThis is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 3.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: \u003Ca href=\u0022http:\/\/creativecommons.org\/licenses\/by-nc\/3.0\/\u0022\u003Ehttp:\/\/creativecommons.org\/licenses\/by-nc\/3.0\/\u003C\/a\u003E.\u003C\/p\u003E\u003C\/div\u003E\u003Cdiv class=\u0022section ref-list\u0022 id=\u0022ref-list-1\u0022\u003E\u003Ch2\u003EReferences\u003C\/h2\u003E\u003Col class=\u0022cit-list\u0022\u003E\u003Cli\u003E\u003Ca class=\u0022rev-xref-ref\u0022 href=\u0022#xref-ref-1-1\u0022 title=\u0022View reference 1 in text\u0022 id=\u0022ref-1\u0022\u003E\u21b5\u003C\/a\u003E\u003Cdiv class=\u0022cit ref-cit ref-other\u0022 id=\u0022cit-348.mar05_4.g1585.1\u0022\u003E\u003Cdiv class=\u0022cit-metadata unstructured\u0022\u003EWikipedia. Wikipedia. 2012 [updated 19:11, 28 October 2012; cited 30 October 2012]. \u003Ca href=\u0022http:\/\/en.wikipedia.org\/wiki\/Wikipedia\u0022\u003Ehttp:\/\/en.wikipedia.org\/wiki\/Wikipedia\u003C\/a\u003E.\u003C\/div\u003E\u003Cdiv class=\u0022cit-extra\u0022\u003E\u003C\/div\u003E\u003C\/div\u003E\u003C\/li\u003E\u003Cli\u003E\u003Ca class=\u0022rev-xref-ref\u0022 href=\u0022#xref-ref-2-1\u0022 title=\u0022View reference 2 in text\u0022 id=\u0022ref-2\u0022\u003E\u21b5\u003C\/a\u003E\u003Cdiv class=\u0022cit ref-cit ref-journal\u0022 id=\u0022cit-348.mar05_4.g1585.2\u0022 data-doi=\u002210.2196\/jmir.1589\u0022\u003E\u003Cdiv class=\u0022cit-metadata\u0022\u003E\u003Ccite\u003EHeilman JM, Kemmann E, Bonert M, Chatterjee A, Ragar B, Beards GM, et al. Wikipedia: a key tool for global public health promotion. \u003Cabbr class=\u0022cit-jnl-abbrev\u0022\u003EJ Med Internet Res\u003C\/abbr\u003E\u003Cspan class=\u0022cit-pub-date\u0022\u003E2011\u003C\/span\u003E;\u003Cspan class=\u0022cit-vol\u0022\u003E13\u003C\/span\u003E:\u003Cspan class=\u0022cit-fpage\u0022\u003Ee14\u003C\/span\u003E.\u003C\/cite\u003E\u003C\/div\u003E\u003Cdiv class=\u0022cit-extra\u0022\u003E\u003Ca href=\u0022{openurl}?query=rft.jtitle%253DJournal%2Bof%2Bmedical%2BInternet%2Bresearch%2B%255Belectronic%2Bresource%255D%26rft.stitle%253DJ%2BMed%2BInternet%2BRes%26rft.aulast%253DHeilman%26rft.auinit1%253DJ.%2BM.%26rft.volume%253D13%26rft.issue%253D1%26rft.spage%253De14%26rft.epage%253De14%26rft.atitle%253DWikipedia%253A%2Ba%2Bkey%2Btool%2Bfor%2Bglobal%2Bpublic%2Bhealth%2Bpromotion.%26rft_id%253Dinfo%253Adoi%252F10.2196%252Fjmir.1589%26rft_id%253Dinfo%253Apmid%252F21282098%26rft.genre%253Darticle%26rft_val_fmt%253Dinfo%253Aofi%252Ffmt%253Akev%253Amtx%253Ajournal%26ctx_ver%253DZ39.88-2004%26url_ver%253DZ39.88-2004%26url_ctx_fmt%253Dinfo%253Aofi%252Ffmt%253Akev%253Amtx%253Actx\u0022 class=\u0022cit-ref-sprinkles cit-ref-sprinkles-openurl cit-ref-sprinkles-open-url\u0022\u003E\u003Cspan\u003EOpenUrl\u003C\/span\u003E\u003C\/a\u003E\u003Ca href=\u0022\/lookup\/external-ref?access_num=10.2196\/jmir.1589\u0026amp;link_type=DOI\u0022 class=\u0022cit-ref-sprinkles cit-ref-sprinkles-doi cit-ref-sprinkles-crossref\u0022\u003E\u003Cspan\u003ECrossRef\u003C\/span\u003E\u003C\/a\u003E\u003Ca href=\u0022\/lookup\/external-ref?access_num=21282098\u0026amp;link_type=MED\u0026amp;atom=%2Fbmj%2F348%2Fbmj.g1585.atom\u0022 class=\u0022cit-ref-sprinkles cit-ref-sprinkles-medline\u0022\u003E\u003Cspan\u003EPubMed\u003C\/span\u003E\u003C\/a\u003E\u003C\/div\u003E\u003C\/div\u003E\u003C\/li\u003E\u003Cli\u003E\u003Ca class=\u0022rev-xref-ref\u0022 href=\u0022#xref-ref-3-1\u0022 title=\u0022View reference 3 in text\u0022 id=\u0022ref-3\u0022\u003E\u21b5\u003C\/a\u003E\u003Cdiv class=\u0022cit ref-cit ref-journal\u0022 id=\u0022cit-348.mar05_4.g1585.3\u0022 data-doi=\u002210.1111\/sdi.12059\u0022\u003E\u003Cdiv class=\u0022cit-metadata\u0022\u003E\u003Ccite\u003EThomas GR, Eng L, de Wolff JF, Grover SC. 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Quality of web-based information on inflammatory bowel diseases. \u003Cabbr class=\u0022cit-jnl-abbrev\u0022\u003EInflamm Bowel Dis\u003C\/abbr\u003E\u003Cspan class=\u0022cit-pub-date\u0022\u003E2009\u003C\/span\u003E;\u003Cspan class=\u0022cit-vol\u0022\u003E15\u003C\/span\u003E:\u003Cspan class=\u0022cit-fpage\u0022\u003E1891\u003C\/span\u003E-6.\u003C\/cite\u003E\u003C\/div\u003E\u003Cdiv class=\u0022cit-extra\u0022\u003E\u003Ca href=\u0022{openurl}?query=rft.jtitle%253DInflammatory%2Bbowel%2Bdiseases%26rft.stitle%253DInflamm%2BBowel%2BDis%26rft.aulast%253Dvan%2Bder%2BMarel%26rft.auinit1%253DS.%26rft.volume%253D15%26rft.issue%253D12%26rft.spage%253D1891%26rft.epage%253D1896%26rft.atitle%253DQuality%2Bof%2Bweb-based%2Binformation%2Bon%2Binflammatory%2Bbowel%2Bdiseases.%26rft_id%253Dinfo%253Adoi%252F10.1002%252Fibd.20976%26rft_id%253Dinfo%253Apmid%252F19462423%26rft.genre%253Darticle%26rft_val_fmt%253Dinfo%253Aofi%252Ffmt%253Akev%253Amtx%253Ajournal%26ctx_ver%253DZ39.88-2004%26url_ver%253DZ39.88-2004%26url_ctx_fmt%253Dinfo%253Aofi%252Ffmt%253Akev%253Amtx%253Actx\u0022 class=\u0022cit-ref-sprinkles cit-ref-sprinkles-openurl cit-ref-sprinkles-open-url\u0022\u003E\u003Cspan\u003EOpenUrl\u003C\/span\u003E\u003C\/a\u003E\u003Ca href=\u0022\/lookup\/external-ref?access_num=10.1002\/ibd.20976\u0026amp;link_type=DOI\u0022 class=\u0022cit-ref-sprinkles cit-ref-sprinkles-doi cit-ref-sprinkles-crossref\u0022\u003E\u003Cspan\u003ECrossRef\u003C\/span\u003E\u003C\/a\u003E\u003Ca href=\u0022\/lookup\/external-ref?access_num=19462423\u0026amp;link_type=MED\u0026amp;atom=%2Fbmj%2F348%2Fbmj.g1585.atom\u0022 class=\u0022cit-ref-sprinkles cit-ref-sprinkles-medline\u0022\u003E\u003Cspan\u003EPubMed\u003C\/span\u003E\u003C\/a\u003E\u003Ca href=\u0022\/lookup\/external-ref?access_num=000272568600018\u0026amp;link_type=ISI\u0022 class=\u0022cit-ref-sprinkles cit-ref-sprinkles-newisilink cit-ref-sprinkles-webofscience\u0022\u003E\u003Cspan\u003EWeb of Science\u003C\/span\u003E\u003C\/a\u003E\u003C\/div\u003E\u003C\/div\u003E\u003C\/li\u003E\u003Cli\u003E\u003Ca class=\u0022rev-xref-ref\u0022 href=\u0022#xref-ref-15-1\u0022 title=\u0022View reference 15 in text\u0022 id=\u0022ref-15\u0022\u003E\u21b5\u003C\/a\u003E\u003Cdiv class=\u0022cit ref-cit ref-journal\u0022 id=\u0022cit-348.mar05_4.g1585.15\u0022\u003E\u003Cdiv class=\u0022cit-metadata\u0022\u003E\u003Ccite\u003ERichardson CG, Hamadani LG, Gotay C. 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Wikipedia and osteosarcoma: a trustworthy patients\u2019 information? \u003Cabbr class=\u0022cit-jnl-abbrev\u0022\u003EJ Am Med Inform Assoc\u003C\/abbr\u003E\u003Cspan class=\u0022cit-pub-date\u0022\u003E2010\u003C\/span\u003E;\u003Cspan class=\u0022cit-vol\u0022\u003E17\u003C\/span\u003E:\u003Cspan class=\u0022cit-fpage\u0022\u003E373\u003C\/span\u003E-4.\u003C\/cite\u003E\u003C\/div\u003E\u003Cdiv class=\u0022cit-extra\u0022\u003E\u003Ca href=\u0022{openurl}?query=rft.jtitle%253DJ%2BAm%2BMed%2BInform%2BAssoc%26rft_id%253Dinfo%253Adoi%252F10.1136%252Fjamia.2010.004507%26rft_id%253Dinfo%253Apmid%252F20595302%26rft.genre%253Darticle%26rft_val_fmt%253Dinfo%253Aofi%252Ffmt%253Akev%253Amtx%253Ajournal%26ctx_ver%253DZ39.88-2004%26url_ver%253DZ39.88-2004%26url_ctx_fmt%253Dinfo%253Aofi%252Ffmt%253Akev%253Amtx%253Actx\u0022 class=\u0022cit-ref-sprinkles cit-ref-sprinkles-openurl cit-ref-sprinkles-open-url\u0022\u003E\u003Cspan\u003EOpenUrl\u003C\/span\u003E\u003C\/a\u003E\u003Ca href=\u0022\/lookup\/ijlink\/YTozOntzOjQ6InBhdGgiO3M6MTQ6Ii9sb29rdXAvaWpsaW5rIjtzOjU6InF1ZXJ5IjthOjQ6e3M6ODoibGlua1R5cGUiO3M6NDoiQUJTVCI7czoxMToiam91cm5hbENvZGUiO3M6NzoiamFtaW5mbyI7czo1OiJyZXNpZCI7czo4OiIxNy80LzM3MyI7czo0OiJhdG9tIjtzOjIzOiIvYm1qLzM0OC9ibWouZzE1ODUuYXRvbSI7fXM6ODoiZnJhZ21lbnQiO3M6MDoiIjt9\u0022 class=\u0022cit-ref-sprinkles cit-ref-sprinkles-ijlink\u0022\u003E\u003Cspan\u003E\u003Cspan class=\u0022cit-reflinks-abstract\u0022\u003EAbstract\u003C\/span\u003E\u003Cspan class=\u0022cit-sep cit-reflinks-variant-name-sep\u0022\u003E\/\u003C\/span\u003E\u003Cspan class=\u0022cit-reflinks-full-text\u0022\u003E\u003Cspan class=\u0022free-full-text\u0022\u003EFREE \u003C\/span\u003EFull Text\u003C\/span\u003E\u003C\/span\u003E\u003C\/a\u003E\u003C\/div\u003E\u003C\/div\u003E\u003C\/li\u003E\u003Cli\u003E\u003Ca class=\u0022rev-xref-ref\u0022 href=\u0022#xref-ref-20-1\u0022 title=\u0022View reference 20 in text\u0022 id=\u0022ref-20\u0022\u003E\u21b5\u003C\/a\u003E\u003Cdiv class=\u0022cit ref-cit ref-journal\u0022 id=\u0022cit-348.mar05_4.g1585.20\u0022\u003E\u003Cdiv class=\u0022cit-metadata\u0022\u003E\u003Ccite\u003EAllahwala UK, Nadkarni A, Sebaratnam DF. 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Evidence based medicine: what it is and what it isn\u2019t. \u003Cabbr class=\u0022cit-jnl-abbrev\u0022\u003EBMJ\u003C\/abbr\u003E\u003Cspan class=\u0022cit-pub-date\u0022\u003E1996\u003C\/span\u003E;\u003Cspan class=\u0022cit-vol\u0022\u003E312\u003C\/span\u003E:\u003Cspan class=\u0022cit-fpage\u0022\u003E71\u003C\/span\u003E-2.\u003C\/cite\u003E\u003C\/div\u003E\u003Cdiv class=\u0022cit-extra\u0022\u003E\u003Ca href=\u0022{openurl}?query=rft.jtitle%253DBMJ%26rft.stitle%253DBMJ%26rft.issn%253D0007-1447%26rft.aulast%253DSackett%26rft.auinit1%253DD.%2BL%26rft.volume%253D312%26rft.issue%253D7023%26rft.spage%253D71%26rft.epage%253D72%26rft.atitle%253DEvidence%2Bbased%2Bmedicine%253A%2Bwhat%2Bit%2Bis%2Band%2Bwhat%2Bit%2Bisn%2527t%26rft_id%253Dinfo%253Adoi%252F10.1136%252Fbmj.312.7023.71%26rft_id%253Dinfo%253Apmid%252F8555924%26rft.genre%253Darticle%26rft_val_fmt%253Dinfo%253Aofi%252Ffmt%253Akev%253Amtx%253Ajournal%26ctx_ver%253DZ39.88-2004%26url_ver%253DZ39.88-2004%26url_ctx_fmt%253Dinfo%253Aofi%252Ffmt%253Akev%253Amtx%253Actx\u0022 class=\u0022cit-ref-sprinkles cit-ref-sprinkles-openurl cit-ref-sprinkles-open-url\u0022\u003E\u003Cspan\u003EOpenUrl\u003C\/span\u003E\u003C\/a\u003E\u003Ca href=\u0022\/lookup\/ijlink\/YTozOntzOjQ6InBhdGgiO3M6MTQ6Ii9sb29rdXAvaWpsaW5rIjtzOjU6InF1ZXJ5IjthOjQ6e3M6ODoibGlua1R5cGUiO3M6NDoiRlVMTCI7czoxMToiam91cm5hbENvZGUiO3M6MzoiYm1qIjtzOjU6InJlc2lkIjtzOjExOiIzMTIvNzAyMy83MSI7czo0OiJhdG9tIjtzOjIzOiIvYm1qLzM0OC9ibWouZzE1ODUuYXRvbSI7fXM6ODoiZnJhZ21lbnQiO3M6MDoiIjt9\u0022 class=\u0022cit-ref-sprinkles cit-ref-sprinkles-ijlink\u0022\u003E\u003Cspan\u003E\u003Cspan class=\u0022cit-reflinks-full-text\u0022\u003E\u003Cspan class=\u0022free-full-text\u0022\u003EFREE \u003C\/span\u003EFull Text\u003C\/span\u003E\u003C\/span\u003E\u003C\/a\u003E\u003C\/div\u003E\u003C\/div\u003E\u003C\/li\u003E\u003C\/ol\u003E\u003C\/div\u003E\u003Cspan class=\u0022highwire-journal-article-marker-end\u0022\u003E\u003C\/span\u003E\u003C\/div\u003E\u003Cspan id=\u0022related-urls\u0022\u003E\u003C\/span\u003E\u003C\/div\u003E\u003Ca href=\u0022https:\/\/www.bmj.com\/content\/348\/bmj.g1585.abstract\u0022 class=\u0022hw-link hw-link-article-abstract\u0022\u003EView Abstract\u003C\/a\u003E\u003C\/div\u003E \u003C\/div\u003E\n\n \n \u003C\/div\u003E\n\u003C\/div\u003E\n \u003C\/div\u003E\n\u003C\/div\u003E\n\u003C\/div\u003E\u003Cscript src=\u0022https:\/\/www.bmj.com\/sites\/default\/files\/js\/js_AoTjtjBFXVIx3xrp00xAzPcZR8zo5Q6tA5zAD9IeVxw.js\u0022\u003E\u003C\/script\u003E\n\u003C\/body\u003E\u003C\/html\u003E"}